AGS fully supports the kind of antialising photoshop does when it is used in 32 bit colour mode. If you export your antialiased sprites on a transparent background as png files then import them into AGS with the alpha channel they will be antialised just as they were in PS.
So always draw the sprites on new layers, then you can get rid of the background and they'll export correctly for the 32 bit alpha blending.
So always draw the sprites on new layers, then you can get rid of the background and they'll export correctly for the 32 bit alpha blending.